first:
Joolster, I'm a huge fan of all your work. I wish when I studied art in ancient times that I didn't just have pencils and paints :D But your innovation is amazing....is the row of "people" in your little movie theater the result of one fog emitter?? Blew my mind when I first saw them :)
second:
Cuddles, open the camera and pull the images from the box and put them on a wall. Do not buy frames, use the default ones and recolor them as you like. Save them either on a lot OR place them in a sim's personal inventory. Then, like anything else in your bins, you can clone any sim or build. For example, but the lot on a map, use any sim you wish to move in (residential lot of course) and COLLECT the art/photos. Wash, Rinse, repeat! Each image has one "original" but clones are such fun, and unless you delete the bin's copy of lot or sim, you can use again.
Have not done a ton of this, just Eric Jardin in my studio's New Orleans Entry, but the sim has the portfolio in his personal inventory and in the house.
Joolster mentioned a possible problem re keeping photos in personal inventory; having only used the photographer himself, they are fine, but a lot sounds more stable based on others comments. Remember, a lot can just have some free standing walls done in black or whatever to display your "gallery", and pull said gallery from the bin again and again.
Very verbose, but hope I helped a wee bit :)